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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38c09c63f23b7e6434a5b3410f4004c78e1d5200b2bb6016c818245680799a1' 
  AND token = 'Du+Yre9hVnyf3Np68beRvu1YzHH4ASVKK+/5vEM+YEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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