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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73da5ec0cacefc5cd58b2e51a2af0b7a537b2bc56c80731bd0c05704f882e24' 
  AND token = 'tQy1ExVZ/lIdB4R9OV+w7eRRNyYdlEDMlgA1p0FBlxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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