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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b252124745b578fa192e41ba52b625598b1ac5dbe1931e3a8b9b57df6416073d' 
  AND token = 'xAsvbicJdQ2QJo33x+jlu9BmlQ7JE8j5iWeE7SQNYLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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