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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19486c4b54ddbe641126f160051f8adc841bbabd7d21bc2be856dc4a922aa2ad' 
  AND token = 'ShNkd1GRvij6TJ2g0CONTNH/bqq8lGTIPYJotmkdZr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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