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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64da4086e72dc7419c33e83e4fa6d9a54f0eac3b1f2a5c66db9daa7b5484cb0' 
  AND token = '7FTqez7RQF2pPEcwRaw9op8ER3Z4ze826wkAkrKh2Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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