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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec8b19b80ba863d23dd382bb5349d42e481735d3001b78b4d878c0bbd5809f4' 
  AND token = 'Waln3FfWtRNr1IfY+XS7YOM8zt8FzX6cpqOivmV2Lwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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