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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a529a53d5596d1d64ca5df3513c8007a3b08189ab13b6cb559694bcb9fcf93' 
  AND token = 'LaLlC2CPI6WMOlf1zhSAW50h78QjusIMLyRpzjomlIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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