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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac70fb2915e6c575eee973ff0dfbc979b4216303291444d2bba1b782193452be' 
  AND token = 'AiQT3be87FBbZ1gDkx3eez4v0Bv/msmb3Tx42fmagr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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