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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5dea454dd1338ccd3786a8d488511cb1e6e8589cd440d9cadd2098ec26a98f9' 
  AND token = 'DFH38qN2nr7D5Qapuin9lLzYC8hu58Zg9DANQJw+n2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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