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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d58b96cd76fc6f4f38ad4e0ed8d7095d7fcd22176c9466b1aa07b92494eddb' 
  AND token = 'leOG4vDrZEmjpOYjGHYo1adculf9e85eYYD7yl33Iyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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