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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1841a6e48f1bf713f5f8f28585d39808cd7b4e72fba693ad1a763b0829a2b5b' 
  AND token = 'L6a576tJeEZWkyT40qUa/g3Uyva28Tg/3FDPGkn0c4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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