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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e984f77123d2505ddef7473ae96cc6d81e50e9083def9d4b2196bec89e422fe' 
  AND token = 'r8+lJWhIGco4kIxUZC/FYDgtTD5XjYhFUmyZJ9eHaUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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