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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42595967f3d581f58670cb4f759e7b2a149df553a3e34673b4a62532d923a7f' 
  AND token = 'HWieDzqpKmNZeFV6PT6VYxt8Sdf7g7J7a5Wk8uOSqas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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