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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652a751a16d2bea1699aa36a773faf153ae2b3c342306cdfaa0394893ccb85b2' 
  AND token = 'cCWxVhLxGJqEGK2RRNsSUx+TjdIOD1BtLLBFek5M5us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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