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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa795c6330edd62134145a4829eddcdadb5457394c34fec76e1b53d9bdc0d36' 
  AND token = 'zasQeQnaJrsYy71rvaELB5eG4KLIxnm1Uhp43OVIZGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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