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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26036a204c5ae7913e3db67655312eb3f707f647fcacea9971c11ddc024d3095' 
  AND token = '5ADfpgLZXuxwRO2uS9lDK/3aoD3S/OD0oOEA9Oqv3es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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