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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93488445c7e3caaf7b89d3f2d999d0d2711b007fde70736227bfb3fb5f6d7031' 
  AND token = 'w3UU5choTSxrY12kzrYb08IDXq6/QZN1vUjEIUu1nZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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