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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61efbb0d7c354a877a1c89e33d352505a42398b0cddddce800a2731210b452f8' 
  AND token = 'cpyC4q80WNnrDEUNjN1mmP95SnhT0gKzwPt9BvJOlk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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