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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5317455783a37a7d8d8a62914bb634fc0baa9b4ba66608bfcc50652d658e59' 
  AND token = 'GPPHGOkXBABCmZAH04F7ZcJgq7nKOo8R2Kyf7a5qaNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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