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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d6cc602891be57c64ae2cd50248fc76b1a6df9a8e195c18c047a69d1ef73a4' 
  AND token = 'U9joxSldDh6doUoJiFsRv86pZC/+6vvuYNmosnhdFJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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