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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232f75333aa87eb6971d654e046a7684261095a87505696419be6cd5e0a71f45' 
  AND token = '0e2GPrD2BI5QdY5HA5J9Aj3ZIR3NvesdlwWZLXFx9Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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