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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a2009f3abb7b7c407ab1641fd5c7951714482f9b5b5b2cda6a89ee10215705' 
  AND token = '9Sq7vx89E2xxPa39WcymueTqEaObVQysiBI+5KXF6hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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