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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478062aa895849974a8d5f6c478baa2ce7a13631263908a3a7c0b470a4c8aa92' 
  AND token = '+YRwj/nDeQ9m9OWEL0RH7Cm+Klgeh3C/c8AImxdpHtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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