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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c91124600fbc36f3ba52a7a8628689f31ad921ebc0a8a974befebf6c8146d2' 
  AND token = 'II6oRHOd91mRbNJgOGfhZxt9MCAjnJrBoDKAGsjzsrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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