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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a846ef023d71958af972648fe00c72a136697f299204a35dfa144ca05bc1056' 
  AND token = 'vlNaZbbdiJXiYEO+aM7e77ZM0ArdOUiYK7JulzVxLzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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