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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a7c08a2a264601273f9381b85ebd3169d9a459e1197eaf47cbd19950cb2807' 
  AND token = 'LH5clhCfH2RpJGgHIyBBVgCCfXkoTpSRfSlHhFzpDh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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