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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a2bd858319e284916203661e6bff3cce2b0b058bff76f862141a33900ae341' 
  AND token = 'eJANoKKbdVV8nKmIP2JIUn+DUfmJe8NSG8ulYAg+bfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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