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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd69f171c1eeee446a476f0b54d849e9182b28e2be8b5ec80adf94172a77eadd' 
  AND token = '7UtuEE61fdNCRUwrZe0dIoKjU46WDibb+SnsBqQk9ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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