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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa91a019d5d5c7c4c085158bc5fa4136c405a3e056bb5abb2d2d4e8c31d5dc4' 
  AND token = 'bjPUmGEI2V4J+FGDaJwK7yFX2rwkz6BqleoQLHuiytw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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