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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30c414bf7617937a5a6e3411a2aefe5b3bb58241360540b7ffd77997e577abf' 
  AND token = '6KI5G5l4O1099ZxWWTLdBbyq3QVzC4n9zfubIlXRJFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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