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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98274d4170525bf1d622a367e64084a6fe0cd17d8f8ae208fa81b2191acd2715' 
  AND token = 'EBG2GahiUxsOxLAJJrbytuvmiTB6AqoLunFyeXH87l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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