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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f69ca36e0a12ffcac17776ca2068066b5afb22f0a9c55ddb715f271be0798d9' 
  AND token = 'Y8BItYhyj6QAHTR9XOeBG/7Alw+q3GueaQ+CFCwME4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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