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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd040bf52f8928a92b9c5d46bbc17f12231a5d68130aba7cb7709545f76b8ee77' 
  AND token = '6NFAv1t257LMKHOT8iSJ2Spsj5whKKo0LXW/U+Kb9eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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