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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2b5f6774a4710cc60c31037881f359d75ef568264df7007042dee5c4584109' 
  AND token = 'OtnUcDc1gu6+8xsmnz8xUWzWUYDgvZzVb/1Gzr0CCOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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