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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8f0a7c021e3f17372855ff776c221b8b798f9a50b83b61504a32451adbfa58' 
  AND token = 'thYS4TLcOSd0G6+CY8b8UUGlFOX16ekjglh19s9gvfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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