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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27481254804dbec362e3893effa2174c2aad2a1c6bbf2382a6036704f97447f' 
  AND token = 'YSR+9roAmXRQvCsWkTrVhIS1YObB7wNSFhS42HjPX7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}