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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8aad752476516499115dd5c76132505aebd5fd6dcca6afd498801b18ef10ee' 
  AND token = 'J9n75h2ZwfJLxw1VG1Q8NR4hXWtmScyjmynhHhoCT8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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