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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9a37586a064a87899ee41be23b06f0be8f1ed260cab41c6d0ae35643a2d90c' 
  AND token = 'qJ3wnb6LZ5riLjOs2ubiS/anKowIwvFW7VwjUMO4nJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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