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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b6d3e8a08630fc268a1c7d89a26795900bedcdcd88e1bf58b5adcc6f749f2b' 
  AND token = 'Ydwitj8SgZQpa6jiXNsEsYy23/XxT43/OKaJuu6HRYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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