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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c758ee3848bc8eb3d2dd6124f4b6830d7e7ba47729ba2e88998567b30498b4b9' 
  AND token = 'oppgfNVgOg9GOxQ4LXOWQZHa1bxfdogv+S4uex3gO8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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