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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e1e4b6b1444ba4f9c965adce7140cbcc91742606596c34ffd66d6c76a52121' 
  AND token = 'njvI9Fnd7ErBT5r3rrSjRMGCguePxtNpI+jdhYIc4oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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