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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247e76950d175ae36097759d5a7470b4cf301aae951b230db5576a5ddc0915ee' 
  AND token = 'o6bqq2EDLBO3noYOk5uWnRJR3N3Gf/fZPcKveI1vPwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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