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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d74d5cf3252fafca218093c219568d6ffc99d5f58040136e6776c2222479168' 
  AND token = '1rqOHwQurhdf3EirEKWc03qF7f9SHcPT8OWkeGqvGZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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