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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19641a5e881753e8adbda753981a74ae2d97fb26c0d0b808cd3319a67b69def7' 
  AND token = 'nNAtc+7AMqzaEs3PG5m6wcOKL8J/6pImutCI/ZsJCyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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