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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4066bbf90423cfd7be3586781e7a15ff52cf12d9156f48b71f895eabf134998' 
  AND token = 'Spmmv3WPG5a10TuidhUhIT5CtOOQUd6JPstBcc3dv2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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