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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27641b6738ed37a00f5ec21a9735dfe7969d331f6e7adc5a6a9c1e8a32784f7e' 
  AND token = 'bJDB7iQGol/uNAiAvqes8iLhD7dhwpT2EArfo1ecUhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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