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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5509a06ced5a41ecc90b363c9b812404938466a7666e8445df8f4d305987b480' 
  AND token = 'geYR1WBpQfu8ngI3BWaia+ukvyfY/n+lFYHajsHfOEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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