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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99813e6ea4a85b99eaef8ce329c85b0470a39be38fa17901859a90d652ad686d' 
  AND token = 'YZfPFq5j1x9rOGVJ63J9SI6WaVMw4P+Gsr/Qybkpd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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