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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb88fa8420985bbf7f76c8d7f581c4178c75db581b8cc393ec43927a8e610448' 
  AND token = '8g5s1d5mmkjNOxYEs+YdBqA5U0FQIS+vTgFX4fdC8KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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