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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8d474bf4c10168cd3e2708c2d347d8c80b57a8eb6e3d36f2aabf665eb70fe5' 
  AND token = 'r51XMC/briWphUHpwoz4s9/iljLv4xQyOxyxTO4Bb3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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