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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f456a6ba795538779717ef4a7ec16a9961455a57eadb5f59813f0d70c4b187e5' 
  AND token = 'PA2qmQ69NHPLKtid0Z5omFcs/hfl13ifi3BaQif9FZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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