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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebc03290a657c24fe7e83aab7e872339d0af5e6c497d5a9d7a87f2f2f5052f8' 
  AND token = 'c1tKrMJ5Z+/INbLqaIB2zG/lN71GhA5mz45L1S7tnWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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