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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e65c0969a6b88b391faafb4ae6a123db9f19ec98884e89faaaf39059478711' 
  AND token = 'o835cecGhv4O1VXwkooCamD8ci2Cw1aTu444pEA2pfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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