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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20fc0054b9706c533699c1122d50f34c57f38e1b9ba09eaeab956c7a8a6e358' 
  AND token = 'ojAlH0Kzo+QopWJA3yI/LuJXcIokuUDFJurZ+ZtcIYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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