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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4f4f9763e5925f7587d3216170445e9c280136f7908b2a8dadad77bdf8f30c' 
  AND token = 'cvJ0a6b9TdUKm50JAp6qgZImqe4BA+5GjIlqvmflWdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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